<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>

<div id="example"></div>
<script type="text/babel">
    function tick() {
        const element = (
            <div>
                <h1>Hello, world!</h1>
                <h2>现在是 {new Date().toLocaleTimeString()}.</h2>
            </div>
        );
        ReactDOM.render(
            element,
            document.getElementById('example')
        );
    }

    setInterval(tick, 1000);
</script>

</body>
</html>